Abstract: Systems, apparatuses, and methods to secure a film to a container are provided. An example sealing device utilizes film from a supply of film to seal a lid onto a container. Various sizes of containers are usable with some example sealing devices. Additional features, such as printing on the film and piercing the film for ventilation and/or insertion of a straw are contemplated. One or more markings along the film may be utilized for confirming that an approved film has been loaded into the sealing device. In response, various components or features of the sealing device may be appropriately enabled or disabled. The one or more markings may also be utilized to convey data to the sealing device regarding the installed film, such as for improved operation thereof.

Abstract: An air conditioning unit mounting curb adapted for flat roof-top mounting with provisions for ducts for passage of air to and from an air conditioning unit from and to a plurality of rooms immediately subadjacent and spaced below the roof top. The mounting curb is comprised of a rectangular outer perimeter, a closed bottom, a wall dividing the curb into two plenums, and at least one opening in one of the plenums for supply of air to the rooms and at least one opening in the second plenum for return air from said rooms. The improvement in the mounting curb comprises a bypass means between the plenums, which is responsive to pressure differential acting thereon, providing a variable air volume system. The bypass means consists of an opening in the dividing wall, a damper blade covering the opening and hingeably connected to the return air side of the dividing wall, a lever attached at one end to the damper blade and at the opposite end thereof to an axle rod, which extends through the curb.